. "1-hydroxyethylidene-1, 1-diphosphonic acid (HEDP) from China and India investigation nos. 731-TA-1146-1147 (final)"@en . . "1-hydroxyethylidene, 1-diphosphonic acid (HEDP) from China and India : investigation nos. 731-TA-1146-1147 (final)"@en . . . . . . . . . . . .